lOO Myron Haruion Szvenk 



Males 



Larger, 5.5-6.5 mm. long grindeliae 



Smaller, 4.5 mm. long heleniella 



Nomada (Melanomada) grindeliae Cockerell. 



1903. Nouiada grindeliae Cockerell, Ann. Mag. Nat. Hist., ser. 7, XII, 



p. 210, 3. 

 1903. Nomada (Melanomada) grindeliae Cockerell, Proc. Acad. Nat. 



Sci. Phil., p. 587, ^■ 

 1903. Nomada grindeliae Crawford, Can. Ent., XXXV, p. 334, $ S- 

 1905. Nomada grindeliae Cockerell, Bull. 94, Colorado Exp. Sta., p. 



70, ?c?. 



The type of this species is a male collected at Lincoln, Ne- 

 braska, on flowers of Grindelia squarrosa, September 2, 1901, by 

 J. C. Crawford. Mr. Crawford when describing the female 

 (/. c. ) recorded the species as "common at Lincoln in August; 

 taken on Solidago missonriensis, Grindelia squarrosa. Euphorbia 

 and Lactuca." It has not been collected elsewhere than at 

 Lincoln, and all of the specimens so far taken were captured in 

 the immediate vicinity of the salt flats just west of the city. 

 There it flies commonly in some seasons from August 2^ to 

 September 7, visiting principally the flowers of Grindelia squar- 

 rosa and Solidago serotina. 



Nomada (Melanomada) heleniella Cockerell. 



191 1. Nomada (Melanomada) heleniella Cockerell, Proc. U. S. Nat. 

 Mus., XXXIX, pp. 648-49, ? <S. 



This species was recently described from Victoria, Texas, 

 where four males and three females were collected at Heleniuin 

 temiifolium, September 26, 1904, by J. C. Crawford. A female 

 specimen from Lincoln, Nebraska, collected in August, is only 

 4.5 mm. long, much smaller than any one of the series of eleven 

 females of grindeliae from the same locality before the writer, 

 which are all between 6.5 and 7 mm. long, and as it thus agrees 

 in size with heleniella and does not obviously diflfer from the type 

 of that species in the U. S. National Museum, it is referred to 

 that species rather than considered a dwarfed individual of 

 grindeliae. The two nominal species are identical, however, 

 'except in size. 



100 



